diff --git a/include/gdi.h b/include/gdi.h
index fd2deaf6..ea965581 100644
--- a/include/gdi.h
+++ b/include/gdi.h
@@ -9091,6 +9091,7 @@ typedef enum {
     GLYPH_GRAVITY_POLICY_NATURAL,
     GLYPH_GRAVITY_POLICY_STRONG,
     GLYPH_GRAVITY_POLICY_LINE,
+    GLYPH_GRAVITY_POLICY_MIXED,
 } GlyphGravityPolicy;
 
 /** Get the vertical orientation property of a Unicode character */
@@ -9107,6 +9108,7 @@ MG_EXPORT UVerticalOrient GUIAPI UCharGetVerticalOrientation(Uchar32 uc);
  * pass %GLYPH_GRAVITY_AUTO and %GLYPH_GRAVITY_POLICY_STRONG in.
  *
  * \param script The script type to query
+ * \param vertical TRUE for vertical layout
  * \param base_gravity The base gravity of the layout
  * \param policy The gravity policy
  *
@@ -9116,7 +9118,7 @@ MG_EXPORT UVerticalOrient GUIAPI UCharGetVerticalOrientation(Uchar32 uc);
  * Since: 3.4.0
  */
 MG_EXPORT GlyphGravity GUIAPI ScriptGetGlyphGravity(ScriptType script,
-        GlyphGravity base_gravity, GlyphGravityPolicy policy);
+        BOOL vertical, GlyphGravity base_gravity, GlyphGravityPolicy policy);
 
 /**
  * \fn GlyphGravity GUIAPI ScriptGetGlyphGravityForWide (ScriptType script,
@@ -9136,6 +9138,7 @@ MG_EXPORT GlyphGravity GUIAPI ScriptGetGlyphGravity(ScriptType script,
  * preferred gravity of @script.
  *
  * \param script The script type to query
+ * \param vertical TRUE for vertical layout.
  * \param wide TRUE for wide characters as returned by IsUCharWide()
  * \param base_gravity The base gravity of the paragraph
  * \param policy The gravity policy
@@ -9146,7 +9149,8 @@ MG_EXPORT GlyphGravity GUIAPI ScriptGetGlyphGravity(ScriptType script,
  * Since: 3.4.0
  */
 GlyphGravity ScriptGetGlyphGravityForWide (ScriptType script,
-        BOOL wide, GlyphGravity base_gravity, GlyphGravityPolicy policy);
+        BOOL vertical, BOOL wide,
+        GlyphGravity base_gravity, GlyphGravityPolicy policy);
 
     /** @} end of unicode_ops */
 
@@ -12254,6 +12258,8 @@ MG_EXPORT int GUIAPI UChars2AChars(LOGFONT* logfont, const Uchar32* ucs,
  */
 #define GRF_TEXT_ORIENTATION_MIXED          0x05000000
 
+#define GRF_TEXT_ORIENTATION_LINE           0x06000000
+
 #define GRF_LINE_EXTENT_MASK                0x00C00000
 /**
  * The maximal line extent is fixed.
diff --git a/src/font/unicode-script.c b/src/font/unicode-script.c
index 92a89d94..3b17bce7 100644
--- a/src/font/unicode-script.c
+++ b/src/font/unicode-script.c
@@ -633,7 +633,7 @@ static inline ScriptTypeProperties get_script_properties (ScriptType script)
     return script_properties[script];
 }
 
-GlyphGravity ScriptGetGlyphGravity (ScriptType script,
+GlyphGravity ScriptGetGlyphGravity (ScriptType script, BOOL vertical,
         GlyphGravity base_gravity, GlyphGravityPolicy hint)
 {
     ScriptTypeProperties props = get_script_properties (script);
@@ -641,25 +641,18 @@ GlyphGravity ScriptGetGlyphGravity (ScriptType script,
     if (base_gravity == GLYPH_GRAVITY_AUTO)
         base_gravity = props.preferred_gravity;
 
-    return ScriptGetGlyphGravityForWide (script, props.wide,
+    return ScriptGetGlyphGravityForWide (script, vertical, props.wide,
             base_gravity, hint);
 }
 
-
-#define GLYPH_GRAVITY_IS_VERTICAL(gravity) \
-    ((gravity) == GLYPH_GRAVITY_EAST || (gravity) == GLYPH_GRAVITY_WEST)
-
-GlyphGravity ScriptGetGlyphGravityForWide (ScriptType script,
+GlyphGravity ScriptGetGlyphGravityForWide (ScriptType script, BOOL vertical,
         BOOL wide, GlyphGravity base_gravity, GlyphGravityPolicy hint)
 {
     ScriptTypeProperties props = get_script_properties (script);
-    BOOL vertical;
 
     if (base_gravity == GLYPH_GRAVITY_AUTO)
         base_gravity = props.preferred_gravity;
 
-    vertical = GLYPH_GRAVITY_IS_VERTICAL(base_gravity);
-
     /* Everything is designed such that a system with no vertical support
      * renders everything correctly horizontally.  So, if not in a vertical
      * gravity, base and resolved gravities are always the same.
@@ -688,10 +681,17 @@ GlyphGravity ScriptGetGlyphGravityForWide (ScriptType script,
 
     case GLYPH_GRAVITY_POLICY_LINE:
         if ((base_gravity    == GLYPH_GRAVITY_EAST) ^
-                (props.horiz_dir == GLYPH_RUN_DIR_RTL))
+                (props.horiz_dir == HORIZONTAL_DIRECTION_RTL))
             return GLYPH_GRAVITY_SOUTH;
         else
             return GLYPH_GRAVITY_NORTH;
+
+    case GLYPH_GRAVITY_POLICY_MIXED:
+        // CSS3: horizontal-only scripts are typeset sideways
+        if (props.vert_dir == VERTICAL_DIRECTION_NONE)
+            return GLYPH_GRAVITY_EAST;
+        else
+            return props.preferred_gravity;
     }
 }
 #endif /* _MGCHARSET_UNICODE */
diff --git a/src/newgdi/layout-utils.c b/src/newgdi/layout-utils.c
index 7d696b46..79802089 100644
--- a/src/newgdi/layout-utils.c
+++ b/src/newgdi/layout-utils.c
@@ -135,6 +135,7 @@ static GlyphOrient resolve_glyph_orient(const LAYOUTINFO* layout,
     }
 
     gravity = ScriptGetGlyphGravityForWide(trun->st,
+            layout->rf & GRF_WRITING_MODE_VERTICAL_FLAG,
             trun->flags & TEXTRUN_FLAG_UPRIGHT,
             layout->grv_base, layout->grv_plc);
 
diff --git a/src/newgdi/layoutinfo.c b/src/newgdi/layoutinfo.c
index 5f5c6b90..750b69bd 100644
--- a/src/newgdi/layoutinfo.c
+++ b/src/newgdi/layoutinfo.c
@@ -124,6 +124,10 @@ LAYOUTINFO* GUIAPI CreateLayoutInfo(
             break;
         case GRF_TEXT_ORIENTATION_MIXED:
             layout->grv_base = GLYPH_GRAVITY_SOUTH;
+            layout->grv_plc = GLYPH_GRAVITY_POLICY_MIXED;
+            break;
+        case GRF_TEXT_ORIENTATION_LINE:
+            layout->grv_base = GLYPH_GRAVITY_EAST;
             layout->grv_plc = GLYPH_GRAVITY_POLICY_LINE;
             break;
         case GRF_TEXT_ORIENTATION_UPRIGHT: